Single-component polyurethane waterproof coating and preparation method thereof

A polyurethane waterproof, one-component technology, applied in the field of polyurethane waterproof coatings, can solve the problems of catalysts affecting the storage effect, and achieve the effects of shortening the construction period, increasing the curing speed, and prolonging the storage time

Inactive Publication Date: 2018-01-12
中油佳汇(广东)防水股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the catalyst in the existing one-component polyurethane waterproof coatin

Method used

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  • Single-component polyurethane waterproof coating and preparation method thereof
  • Single-component polyurethane waterproof coating and preparation method thereof
  • Single-component polyurethane waterproof coating and preparation method thereof

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preparation example Construction

[0058] The present invention also discloses a preparation method of the above-mentioned one-component polyurethane waterproof coating, comprising the following steps:

[0059] Stir and mix the measured polyether polyol, put in the filler and stir until evenly mixed to obtain a mixture, which is ground and filtered;

[0060] Raise the temperature of the ground mixture to 101°C to 110°C, and vacuum dehydrate;

[0061] Keep the vacuum environment, cool the dehydrated mixture, add isocyanate to the mixture, stir and react to obtain the heteromer mixture, then add chain extender to stir and react, the reaction temperature is 80°C to 85°C;

Embodiment 1

[0064] This embodiment is used to illustrate a kind of one-component polyurethane waterproof coating disclosed by the present invention and its preparation method, including the following steps:

[0065] Step 1: Feeding, mixing and grinding

[0066] 22 parts by weight of difunctional 2000 molecular weight polyether polyol, 4 parts by weight of trifunctional polyether polyol of 3000 molecular weight, 4 parts by weight of dibutyl phthalate and 20 parts by weight of chlorinated paraffin are mixed in sequence by vacuum suction In the kettle, stir at 75 rpm for 10 minutes until evenly mixed, then put 0.3 parts by weight of pigment powder, 6 parts by weight of calcined kaolin and 28 parts by weight of calcined talc into the mixing kettle, wherein, calcined kaolin: Bulk specific gravity: 1.05 Gram / cubic centimeter, fineness 1250 mesh, oil absorption 55%. Calcined talcum powder: bulk specific gravity: 1.22 g / cm3, fineness: 1250 mesh, oil absorption: 28%. Stir at 85 rpm for 15 minute...

Embodiment 2

[0084] This embodiment is used to illustrate a kind of one-component polyurethane waterproof coating disclosed by the present invention and its preparation method, including most of the operation steps as in Example 1, and its difference is:

[0085] Step 5: Catalytic reaction and vacuum defoaming

[0086] When the temperature is lowered to 45° C., the stirring speed is adjusted to 85 rpm, and 0.03 parts by weight of catalyst microcapsules are slowly added at normal pressure and stirred for 5 minutes. For ethylene-vinyl acetate copolymer, adjust the stirring to 75 rpm, vacuumize and defoam for 10 minutes, open the vent valve of the reactor, let the internal pressure of the reactor reach normal pressure, and turn off the vacuum pump.

[0087] When in use, heat the one-component polyurethane waterproof coating to 70°C, and after stirring for 5 minutes, mark the coating as S2.

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Abstract

In order to overcome the problem that the storage effect is affected by a catalyst in conventional simple-component polyurethane waterproof coating, the invention provides a single-component polyurethane waterproof coating, which is characterized by being prepared from the following components: polyether polyol, isocyanate, filler, catalyst microcapsules, chain extender and solvent; the catalyst microcapsule consists of a core and a shell wrapping the core, the core contains a palladium catalyst, and the melting point of the shell is between 50 DEG C and 70 DEG C. Moreover, the invention further discloses a preparation method for the single-component polyurethane waterproof coating. The single-component polyurethane waterproof coating provided by the invention can prevent the palladium catalyst from affecting unreacted isocyanate on a prepolymer in the process of storage, thus prolonging the storage time.

Description

technical field [0001] The invention belongs to the field of polyurethane waterproof coatings, in particular to a single-component polyurethane waterproof coating and a preparation method thereof. Background technique [0002] Due to its good waterproof performance, polyurethane waterproof coatings are widely used in roofing and underground projects of civil and industrial buildings, municipal projects, bridges, dams and other projects, and are also suitable for waterproofing of kitchens, balconies, parking lots and other projects. Common polyurethane waterproof coatings include two-component polyurethane waterproof coatings and one-component polyurethane waterproof coatings. [0003] The one-component polyurethane waterproof coating usually contains polyurethane resin prepolymer of isocyanate group. It does not need to add curing agent when using it. The coating is directly coated on the required position, and the coating is exposed to the air, and the trace moisture in the...

Claims

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Application Information

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IPC IPC(8): C09D175/08C09D7/61C08G18/76C08G18/48C08G18/30C08G18/22
Inventor 曾新龙吴光林
Owner 中油佳汇(广东)防水股份有限公司
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